ELECTRON MiCHOSCOl'V 





W^' 



lA 



ms 



M 



1 





'» 



4P 



^r^*^ 



Gr 



Go 



\ •; 



.» 



CS' 





ur 



II * 





»n^.. 





Fig. 2. Detail of a plasma cell (human epididymis). The nucleus (N) is enveloped 

 bj' a triple-layered membrane. The Golgi Zone (Go) has both lamellar and vesicular 

 components. In addition, dense large granules (Gr) are seen, each surromided by a 

 single membrane. In the center of the Golgi area is the centriole (CS) cut at an angle 

 through its fibrillar components. Above the mitochondrion (M) is the ergastoplasm 

 (granular endoplasmic reticulum) E, with its membrane bound flat cisternae and at- 

 tached RNA granules. At ms the cisternae are more spherical. This shape is predom- 

 inant after cell fractionation and centrifugation. These rounded structures then cor- 

 respond to the microsome -fraction of the cell. The cell border is seen at P with some 

 collagenous fibers in the interstitial space. Magnification 33,000X 



94 



